New C# (.NET) Standard: What Awaits Developers

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New C# (.NET) Standard: What Awaits Developers

The C# and .NET ecosystem continues to evolve rapidly. Recent releases — C# 12 and .NET 9 — set a new direction for the platform: focusing on performance, code safety, and development convenience. In this article, we'll break down the key changes already available to developers and how they will impact everyday work.

Key Innovations in C# 12

C# 12, released alongside .NET 8, brought several long-awaited syntactic improvements:

Primary constructors — you can now declare constructor parameters directly in the class or struct declaration, reducing boilerplate code.
Using aliases for any types — it is now allowed to create aliases not only for named types but also for tuples, arrays, and pointers.
Collection expressions — a new unified syntax for creating lists, arrays, and dictionaries: List<int> numbers = [1, 2, 3];.
Inline arrays — declaring fixed-size arrays directly in structs, which is critical for high-performance scenarios.

What's New in .NET 9

The .NET 9 platform, released in fall 2024, focuses on three pillars: performance, cloud development, and AOT compilation.

Native AOT (Ahead-of-Time compilation) — now supported not only for console applications but also for ASP.NET Core web projects. This provides instant startup and smaller binary sizes.
Improved Garbage Collector (GC) — memory management optimized for containers and servers with limited resources.
New LINQ operators — CountBy, Index, and AggregateBy have been added, simplifying data grouping.
System.Text.Json 9.0 — serialization speed increased by 20–40% through the use of Source Generators and new optimizations.

Why This Matters for Developers

Updates to C# and .NET directly impact development speed and the final product. Source Generators, introduced in .NET 6 and actively evolving now, allow code generation at compile time. This reduces the load on reflection and improves performance.

Additionally, Native AOT opens the door for using C# in scenarios previously dominated by Rust, Go, or C++: cloud functions (FaaS), microservices with cold starts, and IoT devices.

What's Next: Plans for .NET 10

It has already been announced that in .NET 10 (expected in November 2025), the Microsoft team plans:

Deep AI/ML integration through extending ML.NET and supporting ONNX Runtime.
Improvement of cross-platform development on mobile devices (MAUI).
Further expansion of Native AOT for desktop applications WPF and WinForms.

Thus, C# and .NET are not just maintaining their positions but are actively competing with modern languages in the areas of performance and cloud technologies. Developers should keep an eye on updates and